Re: CMUX / ts710 serial multiplex driver for x86_64 architecture

[Christian Gagneraud <cgagneraud@techworks.ie>]

Wolfgang Rosner wrote:
> Dear kernel professionals,
> 
> I'm dealing with a mobile unit development kit that requires multiplexing of 
> several virtual serial lines over one single physical serial.
> The protocol is supposed to follow GSM 07.10 standard and outlined in detail 
> here:
> http://www.roundsolutions.com/techdocs/docs/30268st10299a_CMUX_User_Guide_r2.pdf
> 
> The supplier only supports WIN :-( drivers.
> There appear to be kernel modules around for embedded linux.
> I tried to download one
> http://svn.openezx.org/trunk/src/kernel-2.6/mux/
> but could not manage to build it in my x86_64 environment.
> 
> At the moment, I have no idea whether this module might fulfil my purpose at 
> all.
> Maybe it only implements the module side (i.e. pretending a mobile device), 
> not the application side (the controlling PC).
> What I expect is to load this (presumably with some userspace action and 
> synchronisation commands to the controlled device) ontop of an existing 
> serial connection. As a result, there should be some additional serial 
> devices, where the demux'ed traffic can be piped in and out.
> 
> I find clues that this type of multiplexing is done e.g in some mobile connect 
> utilities, but nowhere (apart from the link given above) I find a dedicated 
> kernel module for right that purpose.
> 
> 
> So here my questions:
> - Is there a version of the above mentioned mux / mux_river / ts0710 / mux_cli 
> for x86_64 available?
> - or could this one from be adapted?
> - is there another implementation of GSM 07.10 MUXing?
> - is there any documentation around?

Hi Wolfgang,

These links might help you:
http://wiki.openmoko.org/wiki/Roadmap/Telephony
http://developer.berlios.de/projects/gsmmux/

Chris

> 
> Although the issue is not core critical for my project, I'd like to contribute 
> if I can. No problem with testing and supplying docs, I think.
> Simple userspace config tool (e.g. some perl script writing/reading some bits 
> to /proc/whats/o/ever) should still be within my capabilities.
> 
> In some ancient time (2.0 or 2.2 kernel as far as I can remember) I have even 
> managed to adopt and build a kernel module for some LC display from a book 
> template, but that's years ago. But I'm not really firm in C, and things 
> might not have become less complex since that days... 
> But if I get help (some pointers where to start, caveats to look for) I might 
> try it, provided there is a chance of success.
> 
> Any help appreciated.
> 
> Yours
> Wolfgang Rosner
> 
> 
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